US8947618B2 - Blue phase liquid crystal display device - Google Patents
Blue phase liquid crystal display device Download PDFInfo
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- US8947618B2 US8947618B2 US13/430,834 US201213430834A US8947618B2 US 8947618 B2 US8947618 B2 US 8947618B2 US 201213430834 A US201213430834 A US 201213430834A US 8947618 B2 US8947618 B2 US 8947618B2
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133603—Direct backlight with LEDs
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133624—Illuminating devices characterised by their spectral emissions
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/137—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
- G02F1/13793—Blue phases
-
- G02F2001/133624—
-
- G02F2001/13793—
Definitions
- the present disclosure relates to a display. More particularly, the present disclosure relates to a blue phase liquid crystal display.
- blue phase liquid crystals with rapid response are gradually valued, in which the blue phase represents a liquid crystal phase between the isotropic phase and the cholesteric phase and only exists in a narrow temperature range of about 1° C.
- the blue phase mainly has three different types, which are the first blue phase (BP I), the second blue phase (BP II) and the third blue phase (BP III), in which liquid crystals of the first blue phase and the second blue phase are in a cubic form, and liquid crystals of the third blue phase are in an amorphous form and exist in a temperature higher than those of the other two types of blue phase.
- BP I first blue phase
- BP II second blue phase
- BP III third blue phase
- FIG. 1 a and FIG. 1 b are schematic diagrams showing a lattice structure and disclination lines of the first blue phase liquid crystal respectively.
- FIG. 1 c and FIG. 1 d are schematic diagrams showing a lattice structure and disclination lines of the second blue phase liquid crystal respectively.
- a basic unit of the lattice structure of each of the first and second blue phase liquid crystals is a double twist cylinder (DTC) 100 ; that is, the double twist cylinders therein are arranged perpendicular with each other.
- the first blue phase liquid crystal has a body-centered cubic (BCC) structure
- the second blue phase liquid crystal has a simple cubic (SC) structure.
- the disclination lines 102 of the first blue phase liquid crystal and the second blue phase liquid crystal are shown in FIG. 1 b and FIG. 1 d .
- the first blue phase liquid crystals and the second blue phase liquid crystals are shown as platelet texture patterns when being viewed under a polarizing microscope.
- the positive blue phase liquid crystal generally uses a lateral electric field induced by electrodes to change its refractive index, thereby enabling the blue phase liquid crystal to generate the change of the bright/dark state after light passing therethrough.
- the positive blue phase liquid crystals are isotropic in an ideal state and the refractive index change (i.e. ⁇ n) thereof is 0 (zero) in the condition without a lateral electric field from the electrodes.
- the positive blue phase liquid crystals in the ideal state are normally black, which herein means that light cannot pass the blue phase liquid crystals when no voltage is applied thereto.
- the positive blue phase liquid crystals are anisotropic and the refractive index thereof is changed (i.e. ⁇ n>0), such that the light can pass through the blue phase liquid crystals and the bright state can be shown.
- the blue phase liquid crystal layer mainly consists of components including blue phase liquid crystal molecules and chiral dopants.
- the chiral dopant can be used for inducing blue phase liquid crystal molecules to form aforesaid double twist cylinders.
- the lattice period of the blue phase liquid crystals follows a function of the wavelength, and accordingly, a selective Bragg reflection would occur base on an incident light with different wavelengthes.
- the blue phase liquid crystal molecules have a specific reflective band due to the material characteristics.
- the reflective band of undoped blue phase liquid crystal molecules fall in the visible light spectral range.
- the undoped blue phase liquid crystal molecules encounter a light leakage problem from the reflective band in a dark state.
- FIG. 2 is a schematic diagram illustrating a relationship between reflective luminance and wavelength of the reflective light form the positive blue phase liquid crystal layer when the chiral dopants of high concentration are added to the blue phase liquid crystal layer.
- the reflective band 102 of the conventional blue phase liquid crystal layer is usually in an ultraviolet light range 106 located outside the visible light range 104 after the chiral dopants is added at a high concentration.
- the conventional blue phase liquid crystal layer can shift the reflective band 102 of the blue phase liquid crystal layer into the ultraviolet light range 106 by adding the chiral dopants at high concentration to reduce the light leakage problem.
- adding chiral dopants at higher concentration will result in the increase of the operating voltage required by the blue phase liquid crystal layer. This induces a difficulty in operating the blue phase liquid crystal layer.
- the disclosure provides a blue phase liquid crystal display device.
- the blue phase liquid crystal layer may utilize chiral dopants of low concentration to reduce the operating voltage of the blue phase liquid crystal panel.
- the reflective band of the blue phase liquid crystal layer falls in the visible light range.
- the backlight module of the blue phase liquid crystal display device utilizes multiple light sources to generate multiple lights with different primary colors respectively having different primary color bands, instead of utilizing a backlight having a full-visible light band (e.g., white light).
- the reflective band of the blue phase liquid crystal layer is adjusted to be located between two of the primary color bands. Therefore, the blue phase liquid crystal display device may be operated under low operating voltages and remain high contrast ratios without a light leakage problem.
- An aspect of the invention is to provide a blue phase liquid crystal display device which includes a backlight module and a blue phase liquid crystal display panel.
- the backlight module includes a first light source and a second light source.
- the first light source and the second light source generate a first primary color light and a second primary color light respectively within a visible light range.
- the first primary color light has a first primary color band.
- the second primary color light has a second primary color band.
- the blue phase liquid crystal display panel includes a blue phase liquid crystal layer.
- the blue phase liquid crystal layer includes a plurality of blue phase liquid crystal molecules and a plurality of chiral dopants.
- the blue phase liquid crystal layer has a reflective band between the first primary color band and the second primary color band.
- each of the first light source and the second light source comprises a light-emitting diode or an organic light-emitting diode.
- the first primary color light and the second primary color light are a blue light and a yellow light respectively.
- the blue phase liquid crystal layer comprises a polymer-stabilized blue phase liquid crystal layer.
- the polymer-stabilized blue phase liquid crystal layer further comprises a stabilization polymer.
- the blue phase liquid crystal molecules comprise positive blue phase liquid crystal molecules.
- the blue phase liquid crystal display panel further comprises an in-plane switching display unit array used for controlling the positive blue phase liquid crystal molecules.
- the reflective band is located within a visible light range.
- the reflective band is corresponding to a doping concentration of the chiral dopants.
- a doping concentration of the chiral dopants is in a range of about 3% to 10% in weight percentage of the blue phase liquid crystal layer.
- a peak wavelength of the reflective band is substantially located between peak wavelengths of the first primary color band and the second primary color band.
- a range of full width at half-maximum of the reflective band is located between ranges of full width at half-maximum of the first primary color band and the second primary color band.
- the backlight module further comprises a third light source generating a third primary color light.
- the third primary color light has a third primary color band.
- the third light source comprises a light-emitting diode or an organic light-emitting diode.
- the first primary color light and the second primary color light are a blue light and a green light respectively, and the third primary color light is a red light.
- a peak wavelength of the reflective band is substantially 475 nanometers.
- the first primary color light and the second primary color light are a green light and a red light respectively, and the third primary color light is a blue light.
- a peak wavelength of the reflective band is substantially 580 nanometers.
- FIG. 1 a and FIG. 1 b are diagrams showing a lattice structure and disclination lines of the first blue phase liquid crystals respectively;
- FIG. 1 c and FIG. 1 d are diagrams showing a lattice structure and disclination lines of the second blue phase liquid crystals respectively;
- FIG. 2 is a schematic diagram of reflective luminance versus wavelength for the positive blue phase liquid crystals when being driven by electrodes;
- FIG. 3 is a schematic diagram illustrating a blue phase liquid crystal display (LCD) device according to an embodiment of the invention
- FIG. 4 is a schematic diagram illustrating a reflective band of a blue phase liquid crystal layer shown in FIG. 3 ;
- FIG. 5 is a schematic diagram illustrating a relationship between a operating voltage and a peak wavelength of the reflective band of the blue phase liquid crystal layer under different concentrations of the chiral dopants according to the invention
- FIG. 6 and FIG. 7 are schematic diagrams illustrating a reflective band, a primary band and another primary band according to an embodiment of the invention.
- FIG. 8 is a structural diagram illustrating a blue phase LCD device according to another embodiment of the invention.
- FIG. 9 is a schematic diagram illustrating a reflective band of a blue phase liquid crystal layer shown in FIG. 8 ;
- FIG. 10 is a schematic diagram illustrating a reflective band of the blue phase liquid crystal layer according to another embodiment of the invention.
- FIG. 11 is a schematic diagram illustrating a relationship of the reflective luminance and the wavelengths between the blue phase LCD devices of the comparison model and the embodiment of the invention.
- FIG. 12 is a schematic diagram illustrating a relationship of the optical transparencies and the operating voltages between the blue phase LCD devices of the comparison model and the embodiment of the invention.
- FIG. 3 is a schematic diagram illustrating the blue phase liquid crystal display (LCD) device 300 according to an embodiment of the invention.
- the blue phase LCD device 300 includes a backlight module 320 and a blue phase liquid crystal display (LCD) panel 340 .
- the backlight module 320 utilizes multiple light sources to generating multiple lights with different primary colors respectively having different primary color bands.
- a reflective band of the blue phase LCD panel 340 is adjusted to be located between two of the primary color bands. Therefore, the blue phase LCD device 300 can be operated under low operating voltages and remain high contrast ratios without the light leakage problem. The details of the blue phase LCD device 300 are explained in the following paragraphs.
- the backlight module 320 includes two light sources (i.e., a light source 322 and a light source 324 ) with different wavelengths.
- the light source 322 can be used for generating a primary color light Lb
- the light source 324 can be used for generating a primary color light Ly.
- the light source 322 can be a light-emitting diode (LED) or an organic light-emitting diode (OLED) having a blue color, so as to generate the primary color light Lb in blue color.
- LED light-emitting diode
- OLED organic light-emitting diode
- the light source 324 can be a light-emitting diode (LED) or an organic light-emitting diode (OLED) having a yellow color, so as to generate the primary color light Ly in yellow color.
- LED light-emitting diode
- OLED organic light-emitting diode
- the invention is not limited to the blue light and the yellow light for mixing a full-color light, and in another embodiment, a set of lights with other two primary colors can be applied.
- the light source 322 and the light source 324 may also be instead by white light sources integrated with different color filters.
- the backlight module 320 adopting light-emitting diodes (LED) as the light sources can be a direct type backlight module or a side-edge backlight module, but the invention is not limited thereto.
- the blue phase LCD panel 340 includes a blue phase liquid crystal layer 342 .
- the blue phase liquid crystal layer 342 includes a plurality of blue phase liquid crystal molecules and a plurality of chiral dopants. Based on the material characteristics of the blue phase liquid crystals, the lattice period of the blue phase liquid crystals follows a function of the wavelength of an incident light, and accordingly, a selective Bragg reflection would occur base on the incident light with different wavelengthes. In other words, the blue phase liquid crystal molecules of the blue phase liquid crystal layer 342 have a specific reflective band.
- FIG. 4 is a schematic diagram illustrating a reflective band 343 of the blue phase liquid crystal layer 342 shown in FIG. 3 .
- the blue primary color light Lb generated by the light source 322 has a primary color band 323 .
- the yellow primary color light Ly generated by the light source 324 has another primary color band 325 .
- FIG. 5 is a schematic diagram illustrating a relationship between the operating voltage and the peak wavelength of the reflective band of the blue phase liquid crystal layer under different concentrations of the chiral dopants according to the present invention.
- the operating voltage is too high for practical applications in the ultraviolet light range when the operating voltage of the blue phase LCD panel 340 is required about 55 volts in order to shift the peak wavelength of the reflective band outside the visible light range (visible spectrum range from 380 nm to 740 nm).
- the operating voltage can be cut down by reducing the concentration of the chiral dopants.
- reducing the concentration of the chiral dopants will make the reflective band fall within the visible light range, and it may cause problems including light leakage and reduction of contrast ratio.
- the reflective band 343 of the blue phase liquid crystal layer 342 is corresponding to a doping concentration of the chiral dopants in the blue phase liquid crystal layer 342 .
- the reflective band 343 of the blue phase liquid crystal layer 342 can be adjusted to be located between the blue primary color band 323 and the yellow primary color band 325 by adjusting the doping concentration of the chiral dopants.
- the doping concentration of the chiral dopants can be from 3% to 10% in weight percentage of the blue phase liquid crystal layer 342 for forming the reflective band 343 in FIG. 4 of the embodiment.
- the reflective band 343 of the blue phase liquid crystal layer 342 falls in the visible light range 304 , the reflective band 343 are located between two primary color bands 323 and 325 generated by the backlight module 320 , such that the light leakage under the dark state can be prevented and the blue phase LCD device 300 can be operated with a high contrast ratio.
- FIG. 6 and FIG. 7 are schematic diagrams illustrating the reflective band 343 , the primary band 323 and the primary band 325 .
- the definition about the reflective band 343 between the primary band 323 and the primary band 325 can be referred to FIG. 6 .
- the peak wavelength 343 a of the reflective band 343 can be located between the peak wavelength 323 a of the primary band 323 and the peak wavelength 325 a of the primary band 325 .
- the definition about the reflective band 343 between the primary band 323 and the primary band 325 can be referred to FIG. 7 .
- a full width at half-maximum (FWHM) range 343 b of the reflective band 343 is located between the FWHM range 323 b of the primary color band 323 and the FWHM range 325 b of the primary color band 325 .
- the FWHM range 343 b of the reflective band 343 is not overlapped either with the FWHM range 323 b of the primary color band 323 or with the FWHM range 325 b of the primary color band 325 .
- the blue phase LCD device 300 in the embodiment of the invention can be operated at a lower operating voltage due to the blue phase liquid crystal layer 342 in the embodiment has a lower doping concentration, in comparison of the conventional blue phase liquid crystal layer operated at a high operating voltage by adding the chiral dopants at high concentration, in order to shift the reflective band of the blue phase liquid crystal layer into the ultraviolet light range, which is located outside the visible light range.
- the blue phase liquid crystal layer 342 may include some other substances except the aforementioned blue phase liquid crystal molecules and chiral dopants, for refining optical behaviors or material behaviors.
- the blue phase liquid crystal layer 342 may further include a stabilization polymer, e.g., a polymer that is polymerized from monomers or photo-initiators.
- the blue phase liquid crystal layer 342 can be a polymer-stabilized blue phase liquid crystal layer.
- the polymer stabilization process is known by those in the art, and thus is not further described herein.
- the blue phase liquid crystal molecules of the blue phase liquid crystal layer 342 preferably can be positive blue phase liquid crystal molecules.
- the blue phase LCD panel 340 may further include an in-plane switching (IPS) display unit array 344 .
- the in-plane switching (IPS) display unit array 344 can be used for controlling the positive blue phase liquid crystal molecules.
- the blue phase liquid crystal molecules of the blue phase liquid crystal layer 342 also can be negative blue phase liquid crystal molecules, which can be controlled by a vertical alignment (VA) display unit array for achieving similar effects.
- VA vertical alignment
- the blue phase LCD device 300 can be operated at a low operating voltage with a high contrast ratio.
- the backlight module 320 of the blue phase LCD device 300 includes two light sources (the light source 322 and the light source 324 ), but the invention is not limited thereto.
- FIG. 8 is a structural diagram illustrating a blue phase LCD device 500 according to another embodiment of the invention.
- the blue phase LCD device 500 includes a backlight module 520 and a blue phase LCD panel 540 .
- the backlight module 520 of the blue phase LCD device 500 includes three light sources, such as a light first source 522 , a second light source 524 and a third light source 526 .
- FIG. 9 is a schematic diagram illustrating a reflective band 543 a of a blue phase liquid crystal layer 542 shown in FIG. 8 .
- the light source 522 can be used for generating a primary color light Lb in blue color.
- the light source 524 can be used for generating a primary color light Lg in green color.
- the light source 526 can be used for generating a primary color light Lr in red color.
- each of the light source 522 , the light source 524 and the light source 526 can be a light-emitting diode (LED) or an organic light-emitting diode (OLED).
- LED light-emitting diode
- OLED organic light-emitting diode
- the invention is not limited to the blue, green and red lights. In some other embodiments, a set of lights with three, four or six different colors can be applied. For example, cyan, yellow and/or magenta colors can be added thereto.
- the blue primary color light Lb generated by the light source 522 has a primary color band 523 .
- the green primary color light Lg generated by the light source 524 has a primary color band 525 .
- the red primary color light Lr generated by the light source 526 has a primary color band 527 .
- the blue phase LCD panel 540 includes a blue phase liquid crystal layer 542 .
- the blue phase liquid crystal layer 542 includes a plurality of blue phase liquid crystal molecules and a plurality of chiral dopants. As shown in FIG. 9 , the blue phase liquid crystal layer 542 have a reflective band 543 a .
- the reflective band 543 a is located between the between the primary color band 523 of the blue primary color light Lb and the primary color band 525 of the green primary color light Lg.
- the blue primary color light Lb and the green primary color light Lg are the first and the second primary color lights
- the red primary color light Lr is the third primary color light.
- locating the reflective band 543 a between two primary bands 523 and 525 can be referred to that the peak wavelength 543 a of the reflective band 543 is substantially located between the peak wavelength of the primary band 523 and the peak wavelength of the primary band 525 .
- the peak wavelength 543 a of the reflective band 543 can be about 475 nanometers.
- locating the reflective band 543 a between two primary bands 523 and 525 can be referred to that a full width at half-maximum (FWHM) range of the reflective band 543 is located between the FWHM range of the primary color band 523 and the FWHM range of the primary color band 525 .
- FWHM full width at half-maximum
- the FWHM range of the reflective band 543 a is preferably not overlapped either with the FWHM range of the primary color band 523 or with the FWHM range of the primary color band 525 for preventing light leakage.
- Detail definition of the peak wavelengths and the FWHM range can be referred to FIG. 6 , FIG. 7 and the corresponding paragraphs, and thus are not to be repeated herein.
- the reflective band 543 a of the blue phase liquid crystal layer 542 is corresponding to a doping concentration of the chiral dopants.
- the reflective band 543 a of the blue phase liquid crystal layer 542 can be adjusted to be located between the blue primary color band 523 and the green primary color band 525 by adjusting the doping concentration of the chiral dopants.
- the doping concentration of the chiral dopants can be 3% to 10% in weight percentage of the blue phase liquid crystal layer 542 for forming the reflective band 543 a in FIG. 9 of the embodiment.
- the reflective band 543 a of the blue phase liquid crystal layer 542 falls in the visible light range 504 , the reflective band 543 a is located between two primary color bands 523 and 525 generated by the backlight module 520 , such that the light leakage under the dark state can be prevented and the blue phase LCD device 500 can be operated with a high contrast ratio.
- the reflective band of the blue phase liquid crystal layer 542 is not limited to the one between the blue primary band 523 and the green primary band 525 .
- FIG. 10 is a schematic diagram illustrating a reflective band 543 b of the blue phase liquid crystal layer 542 according to another embodiment of the invention.
- the reflective band 543 b is located between the green primary band 525 and the red primary band 527 , and the light leakage in the dark state can be prevented as well.
- the blue phase LCD device 500 with the reflective band 543 b may also maintain a high contrast ratio.
- Other components in this embodiment can be referred to explanations of FIG. 8 and FIG. 9 .
- the green primary color light Lg and the red primary color light Lr are the first and the second primary color lights
- the blue primary color light Lb is the third primary color light.
- the reflective band 543 b of the blue phase liquid crystal layer 542 is corresponding to a doping concentration of the chiral dopants.
- the reflective band 543 b of the blue phase liquid crystal layer 542 can be adjusted to be located between the green primary color band 525 and the red primary color band 527 by adjusting the doping concentration of the chiral dopants.
- the doping concentration of the chiral dopants can be from 3% to 10% in weight percentage of the blue phase liquid crystal layer 542 for forming the reflective band 543 b in FIG. 9 of the embodiment, in which a peak length of the reflective band 543 b is about 580 nanometers.
- the aforementioned reflective bands 543 a and 543 b are not limited to the aforementioned wavelength ranges.
- the reflective band in the invention can be adjusted within the visible light range and not overlapped with the primary color lights generated by the backlight module. Appropriate wavelength of the reflective band can be determined by the combination of light sources in the backlight module.
- the doping concentration of the chiral dopants is about 3% to 10% in weight percentage.
- the doping concentration of the chiral dopants is about 12% to 20% in weight percentage.
- both of the blue phase liquid crystal layers in the embodiment and the comparison model adopt the combination of the blue phase liquid crystal molecules (such as products numbered JC-1041XX or 5CB made by CHISSO Company) at 30% to 50% in weight percentage and the stabilized monomers (such as products numbered RM257 or TMPTA made by CHISSO Company) at 5% to 10% in weight percentage.
- the blue phase liquid crystal molecules such as products numbered JC-1041XX or 5CB made by CHISSO Company
- the stabilized monomers such as products numbered RM257 or TMPTA made by CHISSO Company
- FIG. 11 is a schematic diagram illustrating a relationship of the reflective luminance and the wavelengths between the blue phase LCD devices of the comparison model and the embodiment of the invention.
- FIG. 12 is a schematic diagram illustrating a relationship of the optical transparencies and the operating voltages between the blue phase LCD devices of the comparison model and the embodiment of the invention.
- the doping concentration of the chiral dopants in the comparison model is relatively higher.
- the peak wavelength of the reflective band in the comparison model is about 350 nanometers outside the visible light range.
- the comparison model requires a larger operating voltage to vary the optical transperency.
- the comparison model requires about 53 volts for adjusting the optical transperency to 0.14.
- the doping concentration of the chiral dopants in the embodiment of the invention is relative lower.
- the peak wavelength of the reflective band in the comparison model is from about 472 nanometers to about 478 nanometers.
- the embodiment needs only 37 volts for adjusting the optical transperency to 0.14.
- wavelight bands of two light sources within the backlight module of the embodiment are designed not to be overlapped with the reflective band, thereby preventing the optical leakage under dark state and elevating the contrast ratio.
- the disclosure provides a blue phase liquid crystal display device.
- the blue phase liquid crystal layer can utilize chiral dopants of low concentration to reduce the operating voltage of the blue phase liquid crystal panel.
- the reflective band of the blue phase liquid crystal layer may fall in the visible light range.
- the backlight module of the blue phase liquid crystal display device utilizes multiple light sources to generate multiple lights with different primary colors respectively having different primary color bands, instead of utilizing a backlight having a full-visible light band (e.g., white light).
- the reflective band of the blue phase liquid crystal layer is adjusted to the one between two of the primary color bands. Therefore, the blue phase liquid crystal display device may be operated under low operating voltages and remain high contrast ratios without the light leakage problem.
Abstract
Description
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TW100135896A TWI526737B (en) | 2011-10-04 | 2011-10-04 | Blue phase liquid crystal display device |
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CN102645782B (en) * | 2011-05-17 | 2014-08-20 | 京东方科技集团股份有限公司 | Method for manufacturing color liquid crystal films, color liquid crystal film and display device |
CN103376590B (en) * | 2012-04-24 | 2016-07-20 | 群康科技(深圳)有限公司 | Display device |
TWI480641B (en) * | 2012-04-24 | 2015-04-11 | Innocom Tech Shenzhen Co Ltd | Display device |
CN105987325B (en) * | 2015-03-02 | 2019-02-15 | 南京瀚宇彩欣科技有限责任公司 | Quantum pipe, backlight module and liquid crystal display device |
TWI628787B (en) * | 2017-06-06 | 2018-07-01 | 友達光電股份有限公司 | Pixel structure |
CN109616011B (en) * | 2018-12-28 | 2020-10-13 | 武汉华星光电技术有限公司 | Backlight module and display device |
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CN102393580B (en) | 2016-04-13 |
TWI526737B (en) | 2016-03-21 |
US20130083271A1 (en) | 2013-04-04 |
CN102393580A (en) | 2012-03-28 |
TW201316084A (en) | 2013-04-16 |
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